Effects of dietary energy sources on early postmortem muscle ...

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phosphocreatine (PCr) concentrations, greater activity of creatine kinase and reduced ... of phosphocreatine (PCr) and the degradation of glycogen to lactate [2].

Open Access Asian-Australas J Anim Sci Vol. 30, No. 12:1764-1772 December 2017 https://doi.org/10.5713/ajas.17.0090 pISSN 1011-2367 eISSN 1976-5517

Effects of dietary energy sources on early postmortem muscle metabolism of finishing pigs Yanjiao Li1,2, Changning Yu1, Jiaolong Li1, Lin Zhang1, Feng Gao1,*, and Guanghong Zhou1

*C  orresponding Author: Feng Gao Tel: +86-25-84399007, Fax: +86-25-84395314, E-mail: [email protected] College of Animal Science and Technology, Key Laboratory of Animal Origin Food Production and Safety Guarantee of Jiangsu Province, Jiangsu Collaborative Innovation Center of Meat Production and Processing, Quality and Safety Control, Nanjing Agricultural University, Nanjing 210095, China 2 College of Animal Science and Technology, Jiangxi Province Key Laboratory of Animal Nutrition, Jiangxi Agricultural University, Nanchang 330045, China 1

Submitted Feb 11, 2017; Revised Apr 26, 2017; Accepted May 22, 2017

Objective: This study investigated the effects of different dietary energy sources on early post­ mortem muscle metabolism of finishing pigs. Methods: Seventy-two barrow (Duroc×Landrace×Yorkshire, DLY) pigs (65.0±2.0 kg) were allotted to three iso-energetic and iso-nitrogenous diets: A (44.1% starch, 5.9% crude fat, and 12.6% neutral detergent fibre [NDF]), B (37.6% starch, 9.5% crude fat, and 15.4% NDF) or C (30.9% starch, 14.3% crude fat, and 17.8% NDF). After the duration of 28-day feeding experi­ ment, 24 pigs (eight per treatment) were slaughtered and the M. longissimus lumborum (LL) samples at 45 min postmortem were collected. Results: Compared with diet A, diet C resulted in greater adenosine triphosphate and decreased phosphocreatine (PCr) concentrations, greater activity of creatine kinase and reduced percentage bound activities of hexokinase (HK), and pyruvate kinase (PK) in LL muscles (p

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